Abstract: A catheter is provided which are useful for mapping circular regions of or near the heart as well as linear regions extending from the tubular regions. The catheter comprises a catheter body, a flexible, generally linear mapping section and a generally circular mapping section. The generally circular mapping section is used to map electrical activity within a tubular region of or near the heart. The generally linear mapping section is used to concurrently map electrical activity of linear regions extending from the tubular region in which the generally circular mapping section is located.