In a large saucepan, combine cranberries and the water. Bring to boiling; reduce heat. Simmer, uncovered, about 3 minutes or until berries pop.
Remove from heat. Add sugar and gelatin, stirring to dissolve. Stir in undrained pineapple. Transfer to a serving bowl. Cover and chill about 6 hours or until firm. To serve, sprinkle with pecans. Makes 10 (1/3-cup) servings.