If I want to know what some kanji, what can I use or which app could I use?

I've played Ocarina of Time since I was a child, and seeing it in japanese while studying the language is so cool! This place is called Lake Hylia, in which "Hylia" is the name of a goddess. in japanese it's

ハイリア湖？

I've put "lake" in the Japanese Dictionary app and found out that this first kanji is "mizuumi". But what about the last one?

Could someone help me, please?