Lake Khanka

Lake Khanka is a massive freshwater lake located in Northeast Asia. It sits directly on the border between Primorsky Krai in Russia and Heilongjiang province in China.

The lake is situated within a large, low-lying area known as the Khankan lowland. It has a distinct pear shape with an extension at its northern end. The surface area of the water changes frequently depending on the climate.

On the northern shore, a smaller body of water called Lake Small Khanka exists. A narrow, sandy spit of land separates this smaller lake from the main body of Lake Khanka.

The lake functions through a complex system of water movement. There are 24 rivers that flow into the lake to keep it filled. Fifteen of these rivers originate in Russia, while eight flow in from China.

Despite the many inflows, there is only one single outflow. This is the Songacha River, which connects the lake to the Ussuri River. The Ussuri River then flows into the larger Amur River system. The water in the lake is often cloudy due to frequent, strong winds. These winds cause strong mixing of the water throughout the basin.

Lake Khanka is a shallow body of water with a varying depth. The average depth is approximately 2 meters, while the prevailing depth is even shallower. However, the greatest depth recorded is 4.6 meters. The lake's volume is typically around 14.7 billion cubic meters. Under certain conditions, the volume can increase to 18.3 billion cubic meters. The residence time of the water in the lake is about 9.9 years. This means it takes nearly a decade for the water to cycle through the system.

History shows that people have studied this lake for centuries. Early maps from the 1700s used many different names for the area. A 1706 map called it Himgon, while a 1739 map used the name Lake Hinka.

The explorer Vladimir Arsenyev suggested the name Khanka might come from the word "khanhai," meaning "hollow." This is a term used in Chinese to describe low places. In the past, the lake was known as Khankai-Omo, which means "Sea of bird feathers." This name highlights the immense number of birds that inhabit the region.

The biological significance of the lake is supported by specific numbers. There are 52 different species of fish living in these waters. These species include carp, perch, silver carp, catfish, and snakehead. Many of these aquatic invertebrates and fish are endemic, meaning they are found nowhere else.

The lake is also a vital location for many bird species that nest or stop along the banks. Because of this rich biodiversity, the Ramsar Convention named it a wetland of international importance in 1971.

There are even curious historical accounts involving the lake. In the ancient text "Dream Pool Essays," a man observed a strange object near the lake. This object was described as being as bright as a pearl. It allegedly opened a door that released intense, sunbeam-like light. This light was so strong that it cast shadows of trees ten miles away. The object reportedly took off at a high speed, descending like a setting sun. While these accounts are unusual, they show how much attention the lake has drawn over time.

Today, the lake is protected through international cooperation. In 1990, the Khanka Nature Reserve was established in the Soviet portion of the basin. In 1996, Russia and China signed an agreement to create an international nature reserve. This includes the Khankai Reserve in Russia and the Singkai-Hu Reserve in China.

The surrounding terrain is quite swampy, featuring diverse ecosystems. These include meadows, forest-steppes, and steppe plant communities. These areas are covered by thick mats of sedge and grass that stretch for many kilometers.