Gurio Lamanna  Gurio Lamanna (also incorrectly called Gurlamanna) is a doline shaped like a coat of arms located in the Murge plateau and falling into Gravina in Puglia's territory, on the border with Altamura, Apulia, southern Italy. It is "one of the largest karst landforms of the Murge plateau" and it is located very close to other two dolines, namely Pulicchio di Gravina and Tre Paduli. Depending on the type of geomorphologic classification employed and the author who suggested it, the karst landform can be defined either a doline or a "karst basin" (). It is traditionally called "karst basin", following the suggestion of Carmelo Colamonico, who first studied the doline and saw in its large size and shallow depth a good reason to distinguish it from a normal doline. The definition of "karst basin", used by Carmelo Colamonico, has been introduced by Renato Biasutti. Carmelo Colamonico stated that Gurio Lamanna is "one of the best examples of karst basin in the Murge plateau". The doline has an external perimeter of over , an average length of ca. and a maximum depth of . It covers an area of . Its walls have a low steepness compared to the nearby doline Pulicchio di Gravina. The bottom of the doline is flat "like a table"; such a flat expanse of land is very uncommon in the barren and hilly landscape of the Murge region. From this point of view, it may be likened to another large "karst basin", that is the expanse of Pescariello (Altamura), far wider and similarly karst. The doline includes a sinkhole, into which part of the rainwater collected in its drainage basin flows out. The whole flat area contains a deep layer of fertile soil, L'intera area piatta contiene un notevole strato di terreno fertile, consequence of the millenary erosion and which is successfully cultivated together with the nearby doline Tre Paduli. Also because of this, the area is different from the stony, arid and difficult to grow Murge region. During the storms, the water in the doline reaches a relatively high level. This water flows out partly via the sinkhole partly via the porous limestone external walls. The water is absorbed in a very short time, usually a few hours.