Marsden Rock is a large sea stack located off the coast of Marsden, South Tyneside, England. It is made of limestone and stands approximately 20 meters high. The rock is a popular spot for birdwatching, as it is home to various seabird species, including guillemots and razorbills. The area around Marsden Rock is part of the Marsden Bay and is known for its stunning coastal scenery. It is a designated Site of Special Scientific Interest (SSSI) due to its unique geological features and rich biodiversity. Visitors can enjoy walking along the nearby cliffs and beaches while taking in the natural beauty of the region.