I shot these reflections from the cruiser on the Li River near Guilin in China.
On the way back to Koh Phi Phi Don from Koh Phi Phi Ley, having cruised by one of the caves from which the locals harvest swifts' nests for birds nest soup, we got some up-close views of the base of the limestone cliffs. The cave action is clearly undercutting the rock over the course of the years.
This overhang in the limestone rack face was a significant swift nesting site. Out of harvesting season, there was no one working on this day. Bird's nest harvesting is a regulated industry and there were signs above the jetty here warning trespassers off. All the bamboo poles you can see here are used by the harvesters to reach the rock ceiling where the swifts build their nests.