The world of the Sacred Sea Project is quite similar to our own, with a few important differences.
The most important one is that this world has two moons. As a result of this, the oceans are more expansive and vast than the oceans here on earth, and the tides are more extreme. Twice a year, the world experiences high water, where the tide can rise the sea level several metres.
This also means that there are a lot more oceanic species than land dwelling ones. Almost the entire clade of ungulates does not exist, with only a few species of dwarf deer and goats as the only existing ones.
Instead, species birds including ones that are extinct on earth fill many of the ecological niches that are filled by ungulates here in the real world.
The primary sentient species of the world are humans.