Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: Ocean monuments are rather difficult to find, but they are easier than some other structures, like woodland mansions. There are two methods of finding ocean monuments. The cheaper but more time-consuming way is to keep looking around deep ocean biome variants, until you find one. The more expensive but less time-consuming way is to acquire an ocean explorer map from a cartographer villager, and use that to locate an ocean monument. However, in addition to having to gather enough materials to trade with a cartographer villager to get the explorer map, you will have to trade all the villager's other trade options, before the ocean explorer map trade will unlock. In Bedrock Edition, cartographers have a 1⁄3 chance to offer an ocean explorer map.