James River- Lunenberg Central-Nottoway. Both not once what they were, but still a pretty good rivalry between historic powerhouses separated by about 17 miles distance
Eastern Shore-Nandua-Arcadia
Bay Rivers-Since I'm a Bay Rivers fan and homer, I will give a little lengthier insight on this one. Grafton, Tabb, Poquoson, York. All 4 pretty close in proximity. Back way in the day, you had Poquoson as the main school in York County, then York High opened in the 1950's, then Tabb formed in the early 70's splitting from York High, then Grafton High opens in the mid 90's splitting from Tabb. Tabb used to be an absolute beast, but hasn't been the same since splitting and Grafton opening. Grafton has been better since it opened in the mid 90's compared to Tabb. All 4 of these are pretty good rivalry games. For Poquoson, I think the biggest rivalry is probably Tabb. Tabb seems to always play Poquoson tough and has had some wins over us. Tabb is only about 5 miles away. Poquoson has done better against Grafton the past 8 or so years compared to Tabb, and Grafton has been better. Just last year, typical example, Poquoson 5-0 and Tabb 0-5, and we escaped with a close win 21-13. As for Lafayette High, other teams in the Williamsburg-Jamestown vicinity such as Bruton, Warhill, and Jamestown aren't just much of a threat for the Rams. Lafayette has been so dominant that's is just hard to give them a true rivalr in my opinion.
As for the Three Rivers District-one poster mentioned Giles and Radford. I would have thought Giles and Glenvar would have been bigger rival judging by the success of both schools, especially with Glenvar coming on the past 10 or so years. I don't know, but the discussions have been pretty active on here when the two schools have played each other the past few years.