Aquatic

Oceans, seas, lakes, and other large waterways are aquatic environments. A subset of aquatic environments, undersea environments are those areas submerged beneath the waves.

Terrain typically requires a boat or a swim speed; depends on the strengths of currents and the weather
Resources seafood, coral, pearls, shipwrecks
Secrets remote islands filled with monsters, isolated communities, pirates, flooded or underwater cities of aquatic creatures

Aquatic Geomancy

Rivers course, tides ebb and flow, and water shifts from ice to vapor, all while creatures grow and adapt within the depths. Casting spells in water calls for a free flow of ideas and emotions. Geomantic rituals intended to change one thing to another often take place in aquatic terrain, or in a liminal space between aquatic terrain and another type of terrain, such as a beach.