Sea of Marmara about 22 parts per thousand, which is slightly greater than that of the Black Sea, but only about two-thirds that of most oceans. The water is much more saline at the sea bottom, averaging salinities of around 38 parts per thousand, similar to that of the Mediterranean Sea. This high-density saline water, like that of the Black Sea, does not migrate to the surface. Water from the Susurluk, Biga (Granicus) and Gonen Rivers also reduces the salinity of the sea, though with less influence than on the Black Sea. With little land in Thrace draining southward, almost all of these
The Arm of the Starfish "The Arm of the Starfish" appearing just three years after "A Wrinkle in Time". The final book in the O'Keefe series, "An Acceptable Time", is also the final book of the Time Quintet. The Murry-O'Keefe books have further connections with other L'Engle titles. The Austin family books have three major crossover characters in common with the O'Keefe books, two of whom are introduced in "The Arm of the Starfish". Canon Tallis meets the Austins in "The Young Unicorns", which takes place a few months after "Starfish". Adam Eddington meets Vicky Austin the following summer in "A Ring of Endless Light",