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The Karelides is an ancient mountain chain located between Eastern Finland and Lapland. It forms the current hill zone of Eastern Finland and Lapland's arctic hills, splitting central Finland. The Karelides formed about 2000 million years ago, when thick sandstone sediments rocked and then folded when continental plates smashed. This made a ridge of quartzite, which has stood there for millions of years. The mountains in the north-west corner of Finnish Lapland belong to the newer Scandinavian Mountains; because they are newer, they are higher than other Finnish mountains. The third mountain group is Svecofennides, which runs from Southern Finland to Sweden.