Does the bathroom sink in an Itasca Navion RV drain into the black or gray water tank?

In an Itasca Navion RV, the bathroom sink typically drains into the gray water tank. The gray water tank collects wastewater from sinks, showers, and other non-toilet sources, while the black water tank is designated for toilet waste. This separation helps manage waste more effectively and is standard in most RV designs.