On the east side of Spadina Avenue, between Front and King Streets, there is a small green space named Clarence Square. During the early 19th century, it was part of the military reserve attached to Fort York. The square was laid out in the 1830s by British engineers to complement the lakeside promenade, a green area near the lake where citizens were able to enjoy strolling and picnicking during good weather. In those years, Lake Ontario was directly to the south of it. The shoreline was eventually pushed further south by dumping landfill into the harbour, so today, Clarence Square is isolated from the water. However, it remains a quiet retreat in the heart of the city, where mature trees provide shelter from the heat of the summer sun.