While the drainage facilities in the Bulgarian cities and towns are well developed things doesn’t look like this in most Bulgarian villages. Drainage problems will not always manifest themselves immediately and the failure to tackle your drainage issues can result in costly remedial measures, which could have been avoided through diligent planning in the first instance.
Are you looking for sea views, flat open plains or a mountain landscape? Is the plot purely for investment purposes or a place where you intend to build a home for yourself? Do you want to be close to other people or are you looking for a remote retreat in Bulgaria? The location of your land will have an impact on the price; the highest land prices are on the coast but if you move 10-20 km to the inland you will find significantly cheaper prices.