This body of water with over 1/3 of the world’s marine mammals, like the Vaquita, has been called “the aquarium of the world”
On the January 29, 2026 episode of Jeopardy!, contestants were presented with a clue in the category Bodies of Water. The Final Jeopardy clue read: “This body of water with over 1/3 of the world’s marine mammals, like the Vaquita, has been called ‘the aquarium of the world.’” It pointed to a location known for its remarkable biodiversity and conservation significance.
What is the Gulf of California?
The correct response was “What is the Gulf of California?” This body of water, also known as the Sea of Cortez, lies between the Baja California Peninsula and the Mexican mainland. It is celebrated for its rich marine life and has earned the nickname “the aquarium of the world,” a term popularized by the renowned oceanographer Jacques Cousteau.
The Gulf of California spans approximately 160,000 square kilometers and stretches for nearly 1,000 miles. Its warm, nutrient-rich waters support over 900 species of fish and nearly 30 species of marine mammals, including the endangered Vaquita, a small porpoise found only in this region. The high biodiversity and endemism of the area make it one of the most biologically productive marine environments on Earth.
A Critical Habitat for Marine Mammals
One of the most notable aspects of the Gulf of California is that it supports more than one-third of the world’s marine mammal species. These include dolphins, whales, sea lions, and the critically endangered Vaquita. The Vaquita, often cited in environmental discussions, is one of the rarest marine mammals and is teetering on the edge of extinction due to bycatch in illegal gillnet fisheries.
Whale species such as the blue whale, fin whale, and humpback whale are known to migrate through or breed in the Gulf’s waters. The area provides essential feeding and calving grounds for many of these species, which further emphasizes its ecological importance on a global scale. Its relative isolation and variety of habitats—from estuaries to deep underwater canyons—make it a haven for marine life.
Recognition and Conservation Efforts
Due to its environmental significance, parts of the Gulf of California have been designated as UNESCO World Heritage Sites. The islands and protected areas within the Gulf were recognized in 2005 for their outstanding universal value in biodiversity. However, the region also faces numerous conservation challenges, including overfishing, habitat degradation, and pollution.
Efforts by the Mexican government and international conservation organizations have attempted to address these concerns, particularly regarding the preservation of the Vaquita. Despite bans on harmful fishing practices and the establishment of marine protected areas, enforcement and compliance remain ongoing challenges.
The Gulf’s Legacy as “The Aquarium of the World”
The nickname “the aquarium of the world” reflects both the biological richness and the global scientific interest the Gulf of California has attracted. Jacques Cousteau’s expeditions and documentaries brought global attention to the region’s underwater ecosystems. Today, it continues to be a site of marine research, ecotourism, and environmental education.
The Gulf’s significance extends beyond its wildlife. Its waters support local economies through fishing and tourism, although sustainable practices remain a topic of debate. The balance between human activity and ecological preservation is central to ongoing policy discussions surrounding the region.
A Jeopardy! Clue with Depth and Relevance
The Final Jeopardy clue on January 29 served as a reminder of the Gulf of California’s environmental significance and the urgent need to protect its unique ecosystems. By referencing the Vaquita and the title “aquarium of the world,” the clue brought attention not only to a remarkable body of water but also to the broader issues of biodiversity conservation and marine sustainability.
As Jeopardy! often does, this clue sparked curiosity and educational interest—encouraging viewers to explore more about one of Earth’s most diverse and endangered marine environments.