River Basin, home to Peru's largest natural reserves.

The vast Peruvian jungle, which surrounds the wide and winding Amazon river, is divided into two differentiated areas: the cloud forest (above 700 masl), which features a subtropical, balmy climate, with heavy rain showers (around 3000 mm a year) between November and March, and sunny days from April to October; and the lowland jungle (below 700 masl), where the dry season runs from April to October and is ideal for tourism, with sunshine and high temperatures often topping 35°C.

During this season, the river levels dip and roads are easy to drive. The rainy season, meanwhile, which runs from November to March, features frequent rain showers (at least once a day) which can damage roads in the area.

The jungle features high humidity all year long. In the southern jungle, there are sometimes cold spells known locally as friajes or surazos, cold fronts which drift up from the far south of the continent between May and August, where temperatures can drop to 8-12°C.