dear freinds, i have visited the following temples in the delta region and feel they are more than 10 acres. 1.chidambaram-natarajar 2.seerkali-brahmapureeswarar 3.vaitheeswarankoil 4.mayooram-mayureswarar 5.thiru-idaimarudhoor-mahadevar 6.thiru-avaduthurai-gomuktheeswarar 7.thirubuvanam(may be smaller but aethetically significant) 8.kudanthai-sarangapani 9.kudanthai-kumbeswarar 10.tharasuram(smaller but aesthetic) 11.tanjore-brahadeeswarar 12.gangaikondam-brahadeeswarar 13.thiru-aiyaru-ayiarappar 14.thru-anaikaval 15.trichy-malaikotai 16.srirangam-ranganathar 17.karur-anilaiyapar 18.thirvaroor-thiyagarajar 19. sikkal-singaravelar,velnadanganni and eeswarar 20.vedaranyam temple 21.nagaipatnam temple 23.dhenugapureeswarar-near kumbakonam 24.mannargudi-rajagopalaswamy 25.vridhachalam-pazhamalainathar
this is my guesstimate of temples in larger in size in the cholamandalam. size comparisson is yet to be done.