Hassa District is located on the Syrian border of Adana Subregion in the east Mediterranean Region. Located in the northeastern side of Hatay, the province has an area of 577 km2. Hassa located in Amanos Mountains and Antakya-Kahramanmaras graben line has a rugged topography because of the tectonic events. Fault lines exist on both sides of the graben field. While the Fault Line of the Dead Sea is limiting the east part of the graben line, the East Anatolian Fault Line is limiting the west of the graben line. These fracture faults have caused some significant changes in the topography such as shift of the river valleys, rerise of the alluvial cones and formation of weak zones on the earth crust. Particularly, volcanic materials which is formed by the weak zones cover huge areas. The volcanic materials which initially appeared by following the fault lines then turned into the central eruptions. Due to the characteristics such as the radiometric age, morphology, stratigraphic position and alteration colors, and typographical structure of lavas, volcanic areas in Hassa vary depending on their formation time. That lava composed in the most recent period spreads to a large area because of the very low viscosity, amount, discharge rate and emergence place of lava. Therefore, basalt thickness gets thinner and decreases to 40-50 m as we get further away from the pyroclastic cones. The purpose of this study is to introduce the pyroclastic and spatter cones, volcanic shapes that are formed according to the types of solidification, the characteristics of lava tunnels formed in the basalts and lava caves in the Basalt Plateau. For this purpose, the field studies have been reviewed and measurements and assessments were made on necessary locations during field work. The study has been completed by a number of studies in accordance with the aim of the study. Pyroclastic cones that create some interesting landforms in the region are operated as a quarry. Therefore, the cones are faced with the danger of extinction in the near future. In addition, Hassa Organized Industrial Zone and Amanos Tunnels that will be constructed to develop Hassa and its vicinity are in the project stage. Lava tunnels will be damaged in several ways when the project. is implented. Therefore, detailed studies on lava tunnels should be carried out and they should be protected In this study volcanic formations have been investigated underdifferent categories on the basis of their various features. Volcanicformations are classified according to their morphological features, sizeand location. The volcanic formations are grouped as small puff volcanicformations, small hollowed volcanic formations, micro-topographicalvolcanic formations and small volcanic formations developing fromunderlying reliefs.There are “hornitos” with some small relief patterns on thesurfaces of lava flows surrounding Haydarlar, Sugediği, Yağmur BorderPost, and Yarımaktepe (Photo 4). “Hornitos” are small rootless ventsthat form on the surface of a lava flow when lava is forced up throughan opening in the surface of a flow and then accumulates around theopening. “Pressure ridges” which can be found at anywhere throughoutbasaltic plateau are one of the small relief patterns which cause surfaceroughness in the topography (Photo 5). Flowing lava under the surfacecreated a puff of 200-250 meters long and 4-5 meters high on the frozencrust and caused some cracks with 2-3 meter length along the longroute. Basaltic blocks of Spatter cones are adherent to the rest becausethese blocks form from the hot lava with low viscosity. The roundshapedcones with 10-15 m height make the relief rough and undulated(Photo 6).There are three cinder cones, one in Söğüt and two in Yarımakte,in the site under study,. Walnut, hazelnut and chickpea sized lapillisshape the main frame of Yarımaktepe volcanic cones (Photo 7a).Adhering to each other through volcanic cement due to the pressure,Lapillis turn into anglomera (Photo 7f). Volcanic bombs with 20-120 cmheight occur in the lapilli zone (Photo 7e). Volcanic ashes and dust inthe form of thin layers are the other materials that can be seen in theprofiles of volcanic cones.One of the volcanic formations in the basalt plateau is smallhollowed volcanic formations. These concave formations appear in twotypes: The hollow as a result of the flowing of lava under the partlyfrozen crust and the hollow as result of the collapse of roofs of cave andtunnels. In the formation of the first hollow, however, the lava flowswithout destroying the crust too much while it spreads.There are also some topographic formations such as arch, bridge,channel, runnel and stone circle in the basalt plateau. The lava flowsout of the cracks in the solidified crust in the slope direction and thisforms a crust in the exterior surface while the lava continues to flow inthe inner side. Lava tunnels and lava caves are one the common small reliefs inthe basalt plateau. There are four big lava tunnels from 50 meters to600 meters long. Named as “Atasoy Lav Tüneli” by the local people(Photo 10), the lava tunnel reaches a height of 6-7 m and a width of 15-20 m. The roof above the tunnel has a thickness of 3-4 m. The lavatunnel is also 600 meters long. The bottom of the tunnel with its ownbranches is covered with the basaltic blocks falling from the ceiling.Although it has a very firm structure, there are some collapsed areas inthe entrance and basaltic blocks in the bottom, which indicates that thetunnel is affected by the seismic motions of Eastern Anatolia Fault Line.Mal Deliği Lava Tunnel is located in the southwest region ofYarımaktepe Volcanic Cone (Photo 11). Tunnel has two tunnels runningvertically, each 100 meters long. The tunnel has a width of 9.2-12.5 mand a height of 4.3-6.7 m. The 30 meter-long part of the tunnel from theentrance towards the northward was collaps