Approaching Nyanza

"The Game of Glory" (for reference, see here) tells us another of Flandry's hobbies. When he establishes radio contact with Nyanza:

"Most of him was listening to the fellow's accent. The inexhaustible variations on Anglic were a hobby of his." (p. 308)

How many planets does Poul Anderson describe as seen from space? Is this the best way to see a planet? Here is Nyanza:

"Nyanza shone before him, the clearest and most beautiful blue of his life, streaked with white cloud-belts and shuddering with great auroral streamers." (p. 307)

There are two moons. The fellow on the radio explains that there are:

no continents;
a medium-sized island, Altla;
rocks and reefs, "...submerged at double high tide, or even at Loa high." (p. 308)

Is Loa one of the moons? Is it named after the Loa? How many planets in the Technic History are mostly covered with water?