Rubble ridges, which have been built parallel to the shore, help retain some sand without fully stopping the natural flow in the lake.

At the price of around $50 for a functional, small wavemaker for a marine reef aquarium, you hardly beat this option. It offers flow rate ranges of 500L/H to 4000L/H, which can be super-gentle or ...

Price includes a coral restoration workshop, training on coral fragmentation, a 2-tank dive and a citizen science card. Note: Scuba equipment rental is not included but can be arranged through the ...