Kasei Valles (Mars)

Word for "Mars" in Japanese.

Kasei Valles is 1,780 km long and was named for the word for "Mars" in Japanese. This huge system is 300 miles wide in some places. In contrast, Earth's Grand Canyon is only 18 miles wide. (wikipedia entry)

A vallis is a valley. On Mars large valles are named after words for Mars/star in various languages. Small valles are named after classical or modern names of rivers.