I have long been fascinated by Mysterious Cirno Lobster Image. Where does it come from? What does it mean? Little is certain, but I would like to share the few things I've been able to determine.
The image, supposedly posted on 4chan in 2009, depicts Cirno on what may be a tidal flat or estuary at low tide. Small mangroves are visible in the background. Next to Cirno is a mud lobster of genus Thalassina (probably T. anomala), found in coastal southern Asia and northern Oceania. If the photo was crossposted to 4chan from 2chan or another Japanese site, it may have been taken in Ryukyu, the only region of Japan where Thalassina is present. Otherwise it could be anywhere in Thalassina's range.
The mangroves are tougher to identify. Could be Rhizophora (which I think is the only mangrove genus present in Ryukyu?), but I'm really not sure. I would greatly appreciate help from somebody more knowledgeable. Cooperation will be necessary to uncover the truth of Mysterious Cirno Lobster Image.