"I have to go to that mount."
Translation:Debo ir a ese monte.
I've heard all those "mounts" but I really think it's a word only used in a mountain's name, as part of a title. So: "I'm going to climb Mount Everest" but "That's the mountain I've always wanted to climb." You wouldn't say that's the mount I want to climb. Actually mount as a noun like that means horse in certain contexts. "His mount in the race is a filly", for instance. But I've never heard it as a common noun meaning mountain. Does "monte" mean "mountain"? I see it does, so here the correct translation would be I have to go to that mountain.