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Can you please read it and see if it is ok? Should there be an article before Panonian pool? Thank you

Oil has been known in our country since the sixteenth century, when it was used for lubrication and in/for medical purposes. The beginnings of research and production of oil were in Međimurje (Selnica) and near Kutina (Mikleuška). After World War II the production and research increased, especially in Pannonian pool. Intensive research is being carried out in the Adriatic sea bed, on the islands of Jabuka, Palagruža and Mljet. South from Pula a gas is found in amounts sufficient for exploatation.
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Oil has been known in our country since the sixteenth century, when it was used for lubrication and for medical purposes. The beginnings of research and production of oil were in Međimurje (Selnica) and near Kutina (Mikleuška). After World War II the production and research increased, especially in Pannonian pool. Intensive research is being carried out in the Adriatic sea bed, on the islands of Jabuka, Palagruža and Mljet. South from *** a gas has been found in amounts sufficient for exploitation.

Whether an article is needed for Pannonian Pool depends on :

If it's the name of an area or town, no article is needed.

If it's an actual pool of water or oil deposits, the article is needed.
Thank you Alan.
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Oil has been known in our country since the sixteenth century when it was used for lubrication and medicinal purposes. Oil research and production began in Medimurje (Selnica) and near Kutina (Mikleuska), then in the post war period this was increased especially in the Pannonian pool. Intensive research is being carried out on the sea bed of the Adriatic near the islands of Jabluka, Palagruza and Mijlet. South from *** sufficient gas has been found to justify further exploration in this area.
Thank you Squeaky. It sounds great.