Stardew Valley Expanded

Stardew Valley Expanded (SVE) is a very popular mod which expands on the original game to add many new places, NPCs, events, etc. It has its own wiki.

Many mods will offer configuration options for SVE compatibility, but not all. SVE changes almost every map in the Vanilla game and therefore mods that use or edit map locations must be made specifically compatible to work. Because SVE is so popular, most mods will state whether or not they are compatible with SVE on their Nexus or ModDrop pages.

Nexus page: https://www.nexusmods.com/stardewvalley/mods/3753