The reliability of historical maps depicting Serbia in the mid-10th century can vary significantly based on several factors, including the sources of the maps, the context in which they were created, and the historical knowledge available at the time.

1. Sources of Historical Maps: Maps from the mid-10th century are often based on a combination of contemporary accounts, earlier maps, and oral traditions. Many maps from this period were created by scholars or cartographers who may not have had direct knowledge of the regions they were depicting. For example, maps created in the Byzantine Empire or by Arab geographers might reflect their own cultural perspectives and biases.

2. Geographical Knowledge: During the 10th century, geographical knowledge was limited. The concept of accurate mapping was still developing, and many maps were more symbolic than precise. They often emphasized trade routes, political boundaries, and significant cities rather than providing an accurate representation of the landscape.

3. Political Context: The political situation in the Balkans during the 10th century was complex, with various kingdoms and empires vying for control. Maps from this period may reflect the political realities of the time rather than an accurate geographical depiction. For instance, the Kingdom of Serbia was emerging during this period, and maps might depict its boundaries based on political claims rather than actual control.

4. Archaeological Evidence: Archaeological findings can provide context and help validate or challenge the information presented in historical maps. For example, excavations in Serbia and surrounding regions can reveal settlement patterns, trade routes, and cultural exchanges that may not be accurately represented in maps.

5. Interpretation and Bias: Historians and cartographers often interpret historical events and places through their own cultural lenses. This can lead to biases in how regions are depicted. Maps may exaggerate the importance of certain areas or downplay others based on the creator's perspective.

In summary, while historical maps of Serbia in the mid-10th century can provide valuable insights into the political and cultural landscape of the time, they should be approached with caution. Cross-referencing with historical texts, archaeological evidence, and modern geographical studies can help assess their reliability. For a more nuanced understanding, consulting academic works on medieval cartography and Balkan history would be beneficial.