Same as the rest of the world. There are 31 days in January, March, May, July, August, October and December.
June may be the darkest month in Antarctica, because it is a winter month.
There are no 'rivers' in Antarctica, unless you consider glaciers as flowing rivers of ice. You can review the lists, below, and identify the longest glaciers in Antarctica.
Lambert Glacier in Antarctica
The Antarctic Peninsula.
Antarctica has the longest coastline among all the continents.
vinson massif
September is the month with the longest name, consisting of 9 letters.
June is the month with most daylight and hence longest.
The Lambert Glacier in East Antarctica, is the longest glacier in Antarctica and the world. It is about 40 km wide and about 400 km long. It drains nearly 8% of the Antarctic Ice Sheet into the Amery Ice Shelf.
You may be thinking of the Antarctic Peninsula.
The Transantarctic Mountains are located in Antarctica, the southernmost continent on Earth. They divide East Antarctica from West Antarctica and are one of the longest mountain ranges in the world.
The brightest month may be December, which is a summer month in the southern hemisphere.