Please help paraphrase The frontier walls built by different dynasties have multiple courses. Collectively, they stretch from Liaodong in the east to Lop Lake in the west, from the present-day Sino-Russian border in the north to Tao River in the south; along an arc that roughly delineates the edge of the Mongolian steppe; spanning over in total. Today, the defensive system of the Great Wall is generally recognized as one of the most impressive architectural feats in history.

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Distinct dynasties built different courses of boundary walls. They reach in total from Liaodong in the east to Lop Lake in the west, from the present-day Sino-Russian border in the north to the Tao River in the south, along an arc that roughly delineates the Mongolian steppe's boundary. The Great Wall's protective system is now widely regarded as one of history's most spectacular architectural marvels.

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explanation: they are talked about more.