In this study, Geyve gorge (Sakarya) and the surrounding diversity of vascular plants were investigated. As a result of the diagnosis; taxa identified 537 genera and 1150 species, 8 subspecies and 1 variety in 113 different families, in research area. These taxa reserved in Pteridophyta section 12 and Spermatophyta section 1138. Spermatophyta of section 9 of the taxa included in the section Gymnospermae and Angiospermae 1129. Belonging to the lower part of Angiospermae 911 taxa Dicotyledonae and 218 taxa Monocotyledonae belongs to the class. According to the taxa phytogeographic region distributions are as follows; 148 taxa the Euro-Siberian character;[these 120 Euro-Siberian, and 26 Euxine and 2 Hirkano-Euxine], 109 taxa Mediterranean character [70 of them Asian, 37 Eastern Mediterranean (Mountain), 1 the Western Mediterranean, and 1 Omni-Mediterranean element], 65 taxa, Irano-Turanian, and 828 taxa of the multi phytogeographical region or unknown region. The rate of endemism in the region, 72 are endemic taxa were identified in the study area and 6.26%, respectively. 72 taxa are endemic and non-endemic taxa 2, risk categories of 64 LC, 5 VU, 3 NT and 2 EN. Life forms in the region, according to the taxa are as follows; Hemicriptophytes to 421, 300 Terofit, 206 Kriptofit, 111 Chamaephytes, 64 Makrofanerofit, 30 Nanophanerophyte and 15 Vascular parasites and 3 Hidrofit. 13 families were the largest in terms of number of taxa included in the numerical distribution are as follows; Asteraceae (124), Lamiaceae (84), Fabaceae (80), Poaceae (76), Brassicaceae (57), Apiaceae (52), Liliaceae (45), Scrophulariaceae (41), Boraginaceae (38), Caryophyllaceae (37), Orchidaceae (33), Rosaceae and Ranunculaceae (27). 21 Number of taxa included in the genus is the largest in the numerical distribution are as follows; Euphorbia (16), Trifolium (15), Veronica (15), Salvia (15), Vicia (14), Astragalus (13), Centaurea and Orchis (12), Lathyrus and