I am not experienced about SVG files. So, I really do not know what to do.
In my SVG file there is a Europe Map: My SVG Image
And the countries are added to SVG codes like that:
<svg viewBox="567.8 340.8 122.8 87.6">
<path d="M666.8 348l0.6-0.6 2.3 0.7 4.5 2.2 1.1 0.9 0.8 3 2.1 5.1 2.9 4.9 1.7 3.6 0.9 3.9-0.6 1.6-4 1.7-0.8 0.5-2 2.7 0 1.2 3.3 1.3 1.8 1 0.8 1-0.2 2.4 0.4 1.1-0.8 1.5 0.1 1.3 1 1.6 1.2 1.8 0 1.3 2.7 2.8 1.9 2.8 1.4 1-1.2 1.3 1.8 2.6 0.1 1.3-1.2 1.8-3 0.5-4.8 4.6-2.4 2.7-3.4 4.4-0.6 1 1.5 3.8-0.1 1.8 1.9 1.4-0.4 0.9-3.3-0.7-0.9-0.2-5.7-1.9-0.8-1.4-1-0.7-3.1-1-3.6-0.3-3.2 0.2-1.4 1.5-1.8-0.1-2.4-1-3 0.1-2.3 1-1.1 2.1-1.7-0.6-1.4 0.4-0.6-2.7-1.4-0.4-3-3-2.2 1.3-1 1.7-2.2 0-0.5-1.5-1.3-0.2-0.5-1.6-2.8-2.2-0.5-1.8-2.7-0.8-0.5 0.2-3.5-1.8-1.8 1-1-0.6-2.7-2.3 1.4-0.5 0-1.6-3.6 0.7-3.3-1.9-2.2-0.6-1.3 0 1.7 2.4-3.5 2.5-1-0.4-1.5-1.9-2-1.8-1.6-0.9 1.6-1.2 0.7-1.1-1.8-1.2-3.2 0.7-0.8-0.9-2.7-1.1-4.6-1.1-1-1.1-0.3-1.1-3.3-0.8 0.1 1.9-2.1 0.4 1.6-3.6 0.4-2.3-1.6-3.2-2.2-0.9 0-1.6-1.9-3.1 0.8-1.1 0.7-2.6-0.8-1.9-2-2.3 0.6-2.6-1.4-1.7-3.3-2.1-1.6-1.4 0.7-1.6 1.9-1.8 0.3-2.7-1.8-4.1-0.7-2.6 2.8 0.9 0.7-0.5-0.1-1.8-4.1-0.7-0.1-1.2 2 0.4 3.8-1.4 6.5-1.8 6.9-1.7 3.3-0.5 2-2.2 1.9-1.7 3.8-0.7 1.3-0.8 2.8-1.2 6.6-1.2 5.5-0.4 5.4 2.3-0.9 0.3-3-1.2 2.2 3.5 1.1 1.2 2 0.9 1.7 0.3 4.9-0.5 2.2-1.1 0.5 0.1 6.6 0.4 22.9 0.9 7 0.1z" id="PL" name="Poland"> </path>
</svg>Yes, this is the line of the polygon of Poland. I have 40 countries like that and I want to add Russia too. However, I don't know how to determine the coordinates of the polygon corners. How can I do that?
I also have a world map SVG, but I don't think that I can add it to Europe map properly. However, these are the coordinates of Russia from that world map:
<svg viewBox="1104 26 675.9 211.9 ">
<path class="Russian Federation" d="M 1661.7 231 1660.3 229.9 1658.4 226.6 1660.9 226.5 1657 219 1652.3 213.6 1655.2 211.4 1662.1 212.5 1661.5 206.3 1658.7 199.5 1659 197.2 1657.7 191.5 1650.8 193.4 1648.2 195.8 1640.6 195.8 1634.6 190 1625.6 185.5 1615.6 183.5 1609.4 177.5 1604.9 173.7 1601.1 171 1593.4 164.8 1587.4 162.6 1578.8 160.7 1572.6 160.9 1567.5 162 1565.8 165.1 1569.5 166.5 1572 169.9 1570.7 171.9 1570.9 178.4 1572.8 181.2 1568.4 185.1 1561 182.7 1555.4 183.3 1551.5 181.2 1548.1 180.5 1543.7 184.9 1537.8 185.9 1534.2 187.5 1527.4 186.5 1522.8 186.5 1517.9 183.3 1511.3 180.4 1505.9 179.5 1500.2 180.3 1496.2 181.5 1487.7 178.9 1484.1 174.3 1477.4 172.7 1472.6 171.9 1465.6 169.4 1464.3 175.8 1468.3 179.4 1465.9 183.8 1457.9 182.2 1452.9 182 1448.1 179.1 1442.9 179 1437.6 177.1 1431.7 180 1425 185.3 1420.3 186.4 1418.6 186.9 1414.2 183.1 1408.2 184 1404.9 181.3 1400.9 180.1 1396.8 176.5 1393.5 175.4 1387.3 177 1378.9 173.5 1377.8 176.7 1359.5 161.1 1351.1 156.4 1351.9 154.4 1342.7 160.2 1338.3 160.5 1337.2 157.2 1330.1 155.1 1325.8 156.6 1321.4 150.3 1312.3 149 1309.2 151.5 1298.3 153.8 1296.6 155.3 1279.6 157.4 1278.2 159.5 1283.3 163.7 1279.3 165.3 1280.8 166.9 1277.3 169.9 1286.7 174.2 1286.5 177.1 1279.5 176.8 1278.7 178.7 1271.4 175.5 1263.7 175.6 1259.3 178.2 1252.7 175.7 1240.7 171.4 1233.1 171.6 1225 178.3 1225.6 182.8 1219.6 179.2 1217.4 186.1 1219.2 187.3 1217.5 192.1 1222.8 196.3 1226.4 196.1 1230.7 200.3 1230.9 203.5 1233.7 204.6 1232.3 208.3 1227.7 209.3 1224.1 215.8 1230.1 221.9 1230.5 226.1 1237.8 233.6 1235.3 236.2 1234.7 237.8 1232.3 237.3 1228 233.5 1226.5 233.3 1222.9 231.8 1220.8 229.2 1215.7 227.9 1212.8 228.9 1211.6 227.7 1204 224.6 1196.3 223.6 1191.7 222.5 1191.3 223.3 1183.7 217.9 1177.5 215.5 1172.4 211.8 1176 210.8 1179.2 205.6 1175.9 203.1 1182.8 200.5 1182.4 199.1 1178.1 200.1 1177.7 197.4 1179.9 195.6 1184.7 195.2 1185 193.1 1183.2 189.6 1184.5 186.4 1184.1 184.5 1176.4 182.5 1173.5 182.6 1169.9 179.7 1166.3 180.7 1159.6 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1188.5 82.1 1188.1 78.6 1195.8 75.9 1208.2 71.3 1211.4 71.5 1208.9 74.8 1214.3 75.4 1216.4 73.5 1224.1 73.4 1229.1 71.1 1235.5 74.4 1238.3 70.8 1232.3 67.7 1233.5 65.9 1246.5 67.5 1253.1 69.2 1271.7 75.4 1272.8 72.6 1266.9 69.7 1266.1 68.6 1260.8 68 1260.6 65.5 1255.9 61.3 1254.8 59.6 1259.1 54.9 1258.5 50.1 1260.7 49.1 1272.1 50.5 1275 53.4 1274.1 57.6 1277.8 59.3 1281.6 63 1285.4 70.4 1292.1 73.7 1292.6 77.4 1289.1 85.2 1294.4 86 1294.9 84 1298.7 82.6 1298.2 79.9 1300.1 77.2 1295.7 74.1 1295.3 70.5 1290.5 70.1 1287.6 67.1 1287.2 61.7 1279 57.4 1283.7 53.9 1280 50.2 1281.9 50.1 1286.1 52.9 1288.2 58 1293.2 59 1288.6 55.2 1293.7 53.1 1301.8 52.8 1311.4 55.8 1304.5 51.5 1299.6 46 1305.5 45 1315 45.2 1322.8 44.5 1317.2 41.9 1318.5 38.6 1322.7 38.4 1327.6 36 1336.9 35.3 1336.7 33.9 1346 33.5 1350.3 34.6 1355.7 32 1362.7 32.1 1361.2 29.9 1362.1 27.9 1368.3 25.9 1376.6 27.5 1373.1 28.7 1382.5 29.4 1386.6 31.8 1388.5 30.6 1399.4 30.7 1411 33.1 1416.5 34.9 1419 37.5 1416.6 39 1410 41.8 1408.9 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</svg>You're facing multiple problems:
TL;DR: try to get a SVG map including all countries you need for your page/application. Different sources may use different projections models
Polygon simplifications is quite mandatory to shrink a precise GeoData output to a reasonable file size. So you won't be able to perfectly stick each country shape to another like in a puzzle – even if the scale and projection is the same you'll see ugly gaps due to simplification and rounding errors.
OK we can do some centering and alignment tasks also deploying viewBox preserveAspectRatio and relative units etc.. But we don't have element based distribution capabilities like in HTML/CSS such as flex or grid.
In other words: SVG can't auto-align or auto-scale adjacent path elements.
If a shape is way beyond the viewBox or larger than the reference element – there is no automatic way to fix this problem. All in all copying elements from one SVG to another won't work unless the elements are based on the same reference system (viewBox size, scale).
As mentioned before map SVGs are usually quite complex. While the idea of using (by default) perfectly scalable vector data seems appealing – it puts a heavy load on a renderer which now has to handle maybe hundred-thousands of vertices to render the map. So the most common approach to render map views based on pre-rasterized image-tiles is often the way more efficient one. So you may first check dedicated map libraries like leaflet or openlayers.
If you're uncertain how or if the paths can be combined – use a editor like Inkscape (free and Open source) or commercial solution like Adobe Illustrator, Affinity Designer, Corel Draw, web services like Boxy ... there are a lot of options.
The point is: a graphical interface is often the easier option to detect and fix problems in a SVG file.
If you need to place certain paths manually - better convert the pathData (the d attribute) to all-relative commands. This way you only need to change the first 2 command values e.g M 666.8 348 the rest of the path will move accordingly. You can easily convert paths to all relative commands e.g with tools like svg-path-ditor