>>31902730Hello!
As shown in the climate map, /lig/'s climate is predominantly humid subtropical (Cfa), which is defined by its relatively hot summer (above 22°C on average, although it's not uncommon for the southern part to hit above 30°C) and a lack of distinct dry season (relatively speaking - you still get more rainfall during summer, but winter rain is not too uncommon).
Be noted that subtropical climate is a relatively wide climate zone (from New York to New Orleans, and from Mackay to Sydney), and /lig/ covers pretty much the entire range of it. As such, while they have similarly hot and wet summer, winter will be noticeably different on the extreme ends of the country - snowfall will range from somewhat common in the north to very uncommon in the south (see the places named above for a rough reference). That said, it's still a rather habitable climate (it's the most populated climate zone on Earth) even if the high humidity can be unbearable for some - you can reasonably grow a variety of food crops from rice to wheat.
As for the natural environment, like most places it will be mostly forested by default, with the ecoregions being divided between subtropical moist forests and temperate broadleaf and mixed forests. The two are fairly similar in composition, with deciduous broadleaf trees mixed with evergreen conifer trees. Due to the former shredding their leaves during winter, seasonal change is observable, and the high humidity means the temperature range can feel wider than it actually is. Depending on the local environment and human activities, some places might be deforested and instead being grassland with patches of woods in between.
As for geology, most of /lig/ is a mixture of geologic platform, deformed basin and extended crust. What it means is that most of the surface rocks will be sedimentary in nature, such as limestone, sandstone and claystone. If you want, you can have a significant chunk of /lig/ be comprised of karst topography - well-weathered limestone terrain with significant cave and underground river systems. Based on existing hydrology (you can change them if you want), I would say the south is more likely to have karst terrain due to a lack of major surface rivers. The rugged terrain is quite scenic, although also difficult for people to traverse, and the soil condition might lead to the development of unusual plant species adapted to the high pH soil.
Tell me if you have any questions about it!