Can I walk to Sanzhoutian Reservoir without buying OCT tickets?

Of course. OCT is a city, an institution and a set of geographical coordinates. You can walk to Sanzhoutian Reservoir without buying tickets for OCT. Sanzhoutian Reservoir is not a scenic spot in OCT East, so tickets are not needed. Sanzhoutian Reservoir is located in Yantian District, Shenzhen City. It is surrounded by mountains and waters, with vast water surface and abundant water resources. It is surrounded by waterfalls, tea gardens and other landscapes with beautiful scenery.