MORE ISLANDS 
The river in that section flowed in a west-northwest 
direction for 1,400 metres. 
We soon after came to a shallow basin, one foot deep 
and 100 metres wide, in which eddies were strong and 
troublesome. There were many pointed rocks scattered 
about in its bed of gravel, as well as three parallel rocky 
barriers right across the basin. 
A rivulet two metres wide at the mouth entered the 
Arinos on the right side, while on the left side we had 
an island 800 metres long, leaving two channels, one 10 
metres wide, the other 40 metres. A tiny streamlet flowed 
into the main stream on the left. Banks, regular dunes 
of gravel, were formed where the river broadened into 
basins. We came to a basin 400 metres wide and 
extremely shallow. Three channels, west-northwest, 
northwest, and north-northeast, were formed in the river 
by two islands, each 400 metres long, the Two Sisters 
Islands, which were in the centre. We found the north- 
northeast channel the best. Where the river narrowed 
again to a width of 50 metres huge rocks stood in the 
centre. From that point for some 300 metres we went 
over a succession of gravel banks and nasty rocks forming 
barriers across the stream. 
Small streamlets entered the Arinos, one on the left, 
the other on the right. A cluster of high rocks was on 
the right bank. On both sides were extensive white sand 
beaches. The river soon widened to 100 metres in a basin 
with an islet 12 feet high, and a cluster of trees on its 
northeast side. Another island 6 feet high, 80 metres 
long, Mosquito Island, with a spit of gravel to the south, 
was near it. 
Rubber trees were most plentiful on the right bank 
where the forest was thick, whereas on the left bank was 
chapada . Huge gorgeous butterflies with black-striped 
brown wings and velvety bodies flew in great numbers 
around the canoe. Some settled on my hat, hands, and 
39 
