the building. Mass shootings at Virginia Tech in 2007 and in Virginia Beach in 2019 led to passage of gun control measures in 2020. Racial injustice and the presence of Confederate monuments in Virginia have also led to large demonstrations, including in August 2017, when a white supremacist drove his car into protesters, killing one, and in June 2020, when protests that were part of the larger Black Lives Matter movement brought about the removal of statues on Monument Avenue in Richmond and elsewhere. Geography Virginia is located in the Mid-Atlantic and Southeastern regions of the United States. Virginia has a total area of , including of water, making it the 35th-largest state by area. The Commonwealth is bordered by Maryland and Washington, D.C. to the north and east; by the Atlantic Ocean to the east; by North Carolina to the south; by Tennessee to the southwest; by Kentucky to the west; and by West Virginia to the north and west. Virginia's boundary with Maryland and Washington, D.C. extends to the low-water mark of the south shore of the Potomac River. The Commonwealth's southern border is defined as 36°30' north latitude, though surveyor error in the 1700s led to deviations of as much as three arcminutes as the North Carolina border moved west. Surveyors appointed by Virginia and Tennessee worked in 1802 and 1803 to reset the border as a line from the summit of White Top Mountain to the top of Tri-State Peak in the Cumberland Mountains. However, errors in this line were discovered in 1856, and the Virginia General Assembly proposed a new surveying commission in 1871. Tennessee's representatives preferred to keep the 1803 line, and in 1893, the U.S. Supreme Court ruled in their state's favor in the case Virginia v. Tennessee. One result of this is the division of the city of Bristol between the two states. Geology and terrain The Chesapeake Bay separates the contiguous portion of the Commonwealth from the two-county peninsula of Virginia's Eastern Shore. The bay was formed from the drowned river valley of the ancient Susquehanna River. Many of Virginia's rivers flow into the Chesapeake Bay, including the Potomac, Rappahannock, York, and James, which create three peninsulas in the bay, traditionally referred to as "necks" named Northern Neck, Middle Peninsula, and the Virginia Peninsula from north to south. Sea level rise has eroded the land on Virginia's islands, which include Tangier