Defendants’ first two assignments of error are each directed to the denial of their motion to dismiss the plaintiff’s complaint. They contend that the plaintiff, having filed a dissent to her husband’s Will on 23 May 1973, no longer had sufficient interest when this action was commenced on 22 July 1976 to permit her to maintain the action and that because of the dissent the court lacked jurisdiction over the subject matter. We do not agree. The record reveals that all that has happened is that plaintiff has filed her dissent within apt time as she was required to do by G.S. 30-2, else she would have been deemed to have waived her right to dissent. Whether plaintiff has a right to dissent is governed by the provisions of G.S. 30-1 and is yet to be determined. That determination cannot be made until, among other matters, it is first ascertained what is “the aggregate value of the provisions under the will for the benefit of the surviving spouse.” G.S. 30-l(a); See In re Estate of Connor, 5 N.C. App. 228, 168 S.E. 2d 245 (1969). The present action for a declaratory judgment is an appropriate procedure for ascertaining what property passed to the surviving spouse under the will, and she has a right to maintain this action in order to determine whether she has a right to dissent. For the same reason, the court had jurisdiction over the subject matter. Defendants’ first two assignments of error are overruled.
Defendants’ third assignment of error challenges the court’s entry of summary judgment declaring the first three items of the will void for vagueness and their fourth assignment of error challenges the court’s ruling that the fourth item of the will is also void for vagueness and that the real property of the testator passed under the seventh item to the plaintiff. We find no error in these rulings.
At the outset we note that summary judgment is appropriate in an action for a declaratory judgment where, as in the present case, there is no genuine issue as to any material fact and the *453rights of the parties may be determined as a matter of law. Blades v. City of Raleigh, 280 N.C. 531, 187 S.E. 2d 35 (1972). Although defendants attempted to introduce affidavits, maps, and an aerial photograph, which they contended would make it possible to ascertain exactly what lands the testator intended to devise by each of the first four items of his Will, these documents were excluded from evidence by the trial court and no exception was taken or assignment of error made to that ruling. Thus, the present case comes before us for decision, as it did before the trial court, on undisputed facts.
 It is undisputed that at the time of his death the testator owned but a single tract of real property, a farm in Orange County. The exact size of this farm is not disclosed in the record, but it is undisputed that the area of the farm is greater than the total number of acres which the testator referred to in and attempted to devise by the first three items of his will. By these items the testator attempted to devise to named devisees separate tracts of land described simply as, first, “my home and 30 Acres of land surrounding the same,” second, “12 Acres of my Plantation located in the Northwest corner of same,” and third, “12 Acres on the East side of my Plantation.” No further description of these tracts is contained in the will, nor does the will refer to any means by which the separate tracts can be identified and set apart. We agree with the trial court that the descriptions contained in the first three items of the will are too vague and indefinite and that the devises attempted to be made therein are void for uncertainty.
The principle is firmly established in our law that a conveyance of land by deed or will must set forth a subject matter, either certain within itself or capable of being made certain “by recurrence to something extrinsic to which the instrument refers. It is essential to the validity of a devise of land that the land be described with sufficient definiteness and certainty to be located and distinguished from other land.
Devin, J. (later C.J.) in Hodges v. Stewart, 218 N.C. 290, 291, 10 S.E. 2d 723, 724 (1940); see, Carlton v. Anderson, 276 N.C. 564, 173 S.E. 2d 783 (1970); Lane v. Coe, 262 N.C. 8, 136 S.E. 2d 269 (1964).
*454In Hodges v. Stewart, supra, our Supreme Court held a devise of “twenty-five acres of the home tract of land including the dwelling and outhouses” void for vagueness and uncertainty in the description of the property attempted to be devised, the opinion of the Court pointing out that the will furnished no means by which the twenty-five acres could be identified and set apart nor did it refer to anything extrinsic by which the twenty-five acres could be located. The court held the description “too vague and indefinite to admit of parol evidence to support it.” We find the description of the tract which the testator attempted to devise in the first item of the will now before us, “my home and 30 acres of land surrounding the same,” no more definite than the description held void for vagueness in Hodges v. Stewart, supra. Similarly, we find the descriptions of the tracts which testator attempted to devise in the second and third items of his will no more definite than the description of the tract which the Supreme Court found void for uncertainty in Carlton v. Anderson, supra.
The question remains concerning the description contained in the fourth item of the will, in which the testator described the property attempted to be devised as the “remainder of my real estate.” We agree with the trial court’s interpretation of this item as constituting an attempted specific devise of a particular tract of land rather than as being a general residuary clause. Such an interpretation is supported by the position of the fourth item in the will and by the fact that the will contains a clearly expressed general residuary clause in Item Seventh. So interpreting Item Fourth as an attempted specific devise of that portion of the testator’s farm which remained after carving out of the farm the tracts referred to in the first three items of the will, it is apparent that, since the boundaries of those tracts cannot be identified, it is equally impossible to identify the boundaries of the tract attempted to be devised by Item Fourth.
We agree with the trial court’s decision that devises attempted to be made by the first four items of the will are void for uncertainty of the descriptions and that the real property which the testator attempted to devise therein passed under Item Seventh to the testator’s widow, the plaintiff in this action. Accordingly, the judgment appealed from is
Judge MARTIN (Harry C.) concurs.
Judge MARTIN (Robert M.) dissents.