POLYGON ((113.3798976 30.68495920000001, 113.3797129 30.6798738, 113.3774954 30.680589, 113.3761095 30.6806684, 113.3759247 30.6827344, 113.377865 30.6828933, 113.3780498 30.6848798, 113.3798976 30.68495920000001))