The River Lee splits into two channels, forming the central island of Cork city. Meitheal Mara’s CORKUMNAVIGATION Guide contains advice on how to get under the city’s 31 bridges and over its 8 weirs at various stages of the tide and thus circumnavigate the city – CORKUMNAVIGATION!
The guide includes a labelled map with information on access points, hazards and significant landmarks along the way. The back of the guide contains images of and information about almost all the bridges and weirs to be negotiated. Those bridges marked by a grey box are particularly low and cannot be passed at certain tides. Likewise, some weirs cannot be crossed until a certain tide height has been reached. Using a tide table (available from chandleries and online) and the Rule of Twelfths you can calculate the rate of tidal rise and fall.