Glastir Uwch yw’r cynllun amaeth-amgylcheddol lefel uwch i Gymru sydd yn rhoi cymorth i ffermwyr a rheolwyr tir i ymgymryd ag ymarferion  rheolaeth penodol ar gyfer cyflawni canlyniadau amgylcheddol allweddol mewn lleoliadau wedi eu targedu. Mae wedi ei gynllunio i ateb amcanion Llywodraeth Cymru o atal newid hinsawdd, gwella ansawdd dwr, cynnal a gwella bioamrywiaeth, rheoli a gwarchod tirlun a’r amgylchedd hanesyddol ynghyd â chreu cyfleoedd newydd i wella mynediad a dealltwriaeth o gefn gwlad.
Glastir Advanced is Wales’ higher-level agri-environment scheme, which provides support to farmers and land managers to undertake specific management practices to bring about key environmental outcomes in targeted locations. It was designed to address the Welsh Government’s objectives of combating climate change, improving water management, maintaining and enhancing biodiversity, managing and protecting landscapes and the historic environment and creating new opportunities to improve access and understanding of the countryside.