Abstract: Hydrological connectivity is the main abiotic driver of wetland ecological processes, particularly within the brackish water zone. Tidal creeks, shaped within this zone, serve as key conduits for the distribution, composition, migration, and transformation of nutrient elements in coastal wetlands. In this study, we aimed to visualize the hydrological connectivity of tidal creeks in the brackish water zone of the Yellow River Delta, China and explore the impact on the content and distribution of various iron compounds in the sediment. The results revealed a strong hydrological connectivity in the southern region of the brackish water zone. The tidal creeks exhibited a clear density gradient, with the lowest density found near the inland areas and the ocean, while the highest density was observed in the intermediate regions. Meanwhile, sediments with higher hydrological connectivity were found to contain greater iron levels. Sampling transects with a higher density of tidal creeks exhibited elevated iron concentrations, while the total iron content generally increased with distance from the tidal creeks. Furthermore, this study identifies a negative correlation between pH and iron content, whereas electrical conductivity shows a positive correlation with iron levels. The study offers some insights into the study of iron in the sediments of coastal wetlands in the Yellow River Delta.