In some cases, it is preferable to protect the complete group of monuments, including associated and adjacent land, rather than to protect isolated monuments within the group.
Mewn rhai achosion, mae’n well gwarchod y grŵp cyfan o henebion, gan gynnwys tir cysylltiol a chyfagos, yn hytrach na gwarchod henebion unigol o fewn y grŵp.