Callao is a small unincorporated community located in Northumberland County, Virginia. The climate in Callao is typical of the mid-Atlantic region, with hot summers and mild winters. The area is characterized by several waterways, including the Yeocomico River and the Potomac River. These waterways support a variety of aquatic life and provide opportunities for outdoor activities such as fishing, boating, and kayaking. Additionally, the area is home to several parks and wildlife management areas, including the Hughlett Point Natural Area Preserve and the Menokin Foundation. These areas offer hiking trails, bird watching, and other recreational opportunities. The hydrology constituents in Callao include various pollutants, such as nitrogen and phosphorus, which can affect the health of the local waterways.