What are some very good geography documentaries?

The first one is Planet Earth, which is a very good documentary and records various ecological units of the earth.

The South Pacific is dotted with islands, and the tidbits behind each episode let you appreciate a vibrant sea area on the earth.

Wild South America and a bird's eye view of the earth are also possible.

Finally, take a look at Wild China, appreciate the similarities and differences between China documentary and foreign countries, and make a comparison.