The tree is enormous, up to 50 m (150') tall and with a crown as much as 30 m (100') in diameter. It grows in the dense jungle of the Amazon basin and, like most tall jungle trees, has branches only near the top. For practical purposes it is unclimbable, and the nuts are harvested by waiting for the fruit which contains them to ripen and fall to the ground. The fruit is round and large, about the size of a coconut. It weighs up to 2 kg (4.5 lb) and has a thick, woody shell. Inside are the nuts, arranged like the segments of an orange, and each having its own woody covering. There are one or two dozen in each fruit. When the fruit is ripe they come loose from their fibrous attachments and rattle about inside. Brazilians call the nuts castanhas (chestnuts) and the gatherers castanheiros. Other names are ‘Para nuts’, because much of the crop comes to market through the state of Para, and ‘cream nuts’ because of the flavour.