This world has gotten the name Bermuda. It's an ironic name referring to Andrew Marvell's poem. A snarky comment on the idea of both refuge and providence.
The planet is very earthlike and even has a large moon that causes impressive tides. It has its own ecosystem. Bermuda's life forms are toxic to Earthlife and vice versa. Human activity tilts the balance in favor of Earth life forms. But the process is slow.
Under normal rules the planet would never have been settled. Worlds with multicellular lifeforms are protected by law. However Bermuda was settled by a lost ship that misjumped. It was a spectacular misjump. The colonists don't really know where they are or if they are even in the same galaxy as Earth. Some people, and not without evidence, suggest that time travel may have occurred.
The local star is weaker in the ultraviolet than Sol. However it's light in the visable spectrum is stronger in blue and violet. How that works out is unknown to the colonists.
There are large nearby nebulas which dominate the night skies of the Southern hemisphere. The Northern hemisphere has many brilliant stars rivaling Earth's Northern skies.
The planetary atmosphere is slightly thicker than Earth's. Sea level air pressure is 18psi. At any latitude the planetary climate is generally cooler and wetter than would be typical of the Earth at the same latitude. However there are still Hadley Cell Deserts and other significant arid areas. However a larger portion of this planet is forested.
In the two centuries since the involuntary colonists got to Bermuda, they've built three main areas of settlement.
The first is in an area roughly resembling Western Europe (very roughly). The main area of settlement is on an island fairly closely resembling Great Britain, especially if Dover were thirty miles always from
Vigo in Spain rather than Calais. This "Europe" has two Irelands, one well south of where a similar island is on Earth, the other slightly north. Both have settlements. Albion, the island resembling Britain, has a "green" (Earth lifeforms ) area the size of the state of Maine. The nearby continent, and the two "Irelands" have green areas the size of Connecticut.
The Second is tropical and resembles southern India in climate. Like early modern Andhra Pradesh, Tamil Nadu, and Kerala, they get three crops a year. There are seven green areas the size of Connecticut in the area.
The third is where the involuntary colonists first landed. An area much like California in climate. This drier area hasn't been as easy to create green areas in. But it has four green areas the size of Connecticut.
More later.