Answer: rilles

AnswerCrossword Clue
RILLESValleys of the moon
RILLESLunar valleys
RILLESMoon valleys
RILLESValleys on the moon.
RILLESMoon features
RILLESLunar trenches
rillesa very small brook
rillesRILLE, a valley on the moon's surface