If human populations expanded at a slow rate of 20 miles per 100 years, then from 1.1 million to 0.9 million years ago (200,000 years) they would have travelled

If human populations expanded at a slow rate of 20 miles per 100 years, then from 1.1 million to 0.9 million years ago (200,000 years) they would have travelled 40,000 miles. This is indeed migration, but not as we think of it today. Such migrations could have been blocked by oceans or high mountains, and were essentially like animal migrations.