The icy, rocky world is seen to be covered with impact craters. Deposits of highly reflective material which may represent frost can be seen along the sun-facing valley walls. The large impact crater near the top, known as Gertrude , is about 180 miles across. At the bottom the 60 mile wide fault valley, Belmont Chasma , cuts into crater Ursula. Titania itself is 1,000 miles in diameter .
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